PoolFix Calcium Hardness Increaser – 4lb Resealable Bag for Swimming Pools | Fast-Acting 94% Calcium Chloride Formula for Balanced Water & Scale Prevention

["Quickly increases calcium hardness levels to prevent scaling, etching, and corrosion.","94% Pure Calcium Chloride: High-quality composition for reliable and effective results.","Protects Pool Surfaces: Prevents damage to plaster, concrete, and fiberglass caused by low calcium levels.","Resealable 4LB Bag, easy to open and reuse when needed."]